BECK, ROGER. "Old Ways: The Reconstruction of Mithraic Doctrine from Iconography." The Religion of the Mithras Cult in the Roman Empire: Mysteries of the Unconquered Sun. : Oxford University Press, 2007-03-08. Oxford Scholarship Online. 2010-01-01. Date Accessed 18 Jun. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199216130.001.0001/acprof-9780199216130-chapter-2>.
BECK, R.(2007-03-08). Old Ways: The Reconstruction of Mithraic Doctrine from Iconography. In The Religion of the Mithras Cult in the Roman Empire: Mysteries of the Unconquered Sun. : Oxford University Press. Retrieved 18 Jun. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199216130.001.0001/acprof-9780199216130-chapter-2.
BECK, ROGER. "Old Ways: The Reconstruction of Mithraic Doctrine from Iconography." In The Religion of the Mithras Cult in the Roman Empire: Mysteries of the Unconquered Sun. : Oxford University Press, 2007-03-08. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199216130.001.0001/acprof-9780199216130-chapter-2.
BECK R. Old Ways: The Reconstruction of Mithraic Doctrine from Iconography. In: Beck R. The Religion of the Mithras Cult in the Roman Empire: Mysteries of the Unconquered Sun. Oxford University Press; 2007. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199216130.001.0001/acprof-9780199216130-chapter-2. Accessed June 18, 2013.